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The <stddef.h> Header File

# include <stddef.h>

This header file, like the <limits.h> header file, contains some definitions required by the C standard and comes with the gcc compiler. Mostly, there are typedefs here that are mandated by the standard. The most common and most used type is size_t which is used as the size of regions of memory, and is the type returned from sizeof.

Stephen Williams